Twine cutting apparatus for round baler

ABSTRACT

A round baler having a pickup, a chamber for forming a cylindrical package of crop material and a generally transverse opening for feeding crop that has been picked up into the chamber. The baler includes a twine handling assembly having at least one twine arm with a twine dispensing end from which twine is dispensed in the vicinity of the transverse opening for applying a plurality of helical wraps on the cylindrical package of crop material formed in the chamber. Twine cutting apparatus is provided for cutting the twine, and a twine guide assembly is mounted to cooperate with the twine cutting apparatus to guide the twine to a cutting mechanism that is transferred to its operative position from a remote position after a predetermined amount of twine has been dispensed.

FIELD OF THE INVENTION

This invention relates generally to agricultural machines for makingtwine wrapped round bales, and more particularly to twine cuttingapparatus for such machines.

BACKGROUND OF THE INVENTION

Agricultural machines towed by a tractor across a field for picking upwindrowed crop material to form a cylindrical bale are commonly referredto as round balers. These machines have either a fixed or an expandablebale forming chamber disposed between opposing vertical sidewalls. Thechamber is usually defined by a floor and transverse confining meanscomprising a continuous flexible apron and/or a plurality of transverserolls. Frequently the apron includes an array of side-by-side beltstrained around a series of rollers that extend between the sidewalls,and the floor consists of either a large roller or a continuous conveyorbelt.

During field operation, crop material such as hay is picked up from theground and fed into the chamber. The volume of crop material increasescontinuously in the chamber until a compact cylindrical package isformed. The package is wrapped while still in the chamber and thenejected onto the ground as a completed bale.

Well known means for wrapping round bales include twine, net and plasticsheet material. When twine is used it is common to utilize a tube todispense twine along the circumference of the formed package as it isbeing rotated in the chamber to helically wrap a continuous strand oftwine around the bale. The twine tube is moved to feed out twine along atransverse path adjacent the outer surface of the cylindrical package asit is being turned in the chamber. Twine wrapping apparatus of this typeis shown in U.S. Pat. No. 5,215,005, issued Jun. 1, 1993 in the name ofStephen C. Schlotterbeck, et al.

When a sufficient amount of twine has been wrapped around the packagethe twine is cut, typically by guiding the twine to a stationary cuttingmechanism which severs the strand by either a positive cutting action orby pulling it against a fixed cutting edge. Referring again toSchlotterbeck, et al, a stationary cutting mechanism is shown whereinthe twine being dispensed is guided across a fixed striker plate andcontinues to feed out until a knife edge is thrust against the strikerplate to severe the twine.

U.S. Pat. No. 4,440,075, issued Apr. 3, 1984 in the name of Melvin V.Gaeddert, also shows a round baler having a stationary cuttingmechanism. The twine is guided to the cutting mechanism and severed bypulling it against an exposed cutting edge.

In another prior art arrangement, shown in U.S. Pat. No. 4,505,197,issued Mar. 19, 1985 in the name of Paul S. Shenberger, et al, the twinecutting mechanism includes a swinging arm that engages the twine andpulls it against a knife. The arm in this device also serves to clampthe supply end of the twine after it is severed.

Another known approach in the round baler prior art is the use of acutting mechanism that is not stationary. U.S. Pat. No. 4,715,175,issued Dec. 29, 1987 in the name of Siegfried Schaible, et al, showsround bale wrapping apparatus in which a cutting mechanism is slideablymoved to its cutting position after the wrapping operation is completed.

As in all aspects of round balers, reliability is a very importantfactor in the twine cutting operation. Serious problems are encounteredif the cutter fails, i.e., the twine has not been severed prior toejection or is some instances the twine continues to feed out long aftera sufficient amount of twine has been wrapped around the package of cropmaterial. Due to the location of many prior art cutting mechanisms in anenvironment that is inherently dusty, failures occur due to build up ofdirt and debris in the vicinity of the twine strand to be cut, causingthe cutting edge to be blocked from contact or to make improper contact.

SUMMARY OF THE INVENTION

An important object of the present invention is to provide improvedtwine cutting apparatus for a round baler which enhances the reliabilityof the baler without affecting the overall performance.

In pursuance of this and other important objects the present inventionprovides for new and unique twine cutting apparatus in a round balercomprising a chamber for forming a cylindrical package of crop material,a generally transverse crop infeed opening in the chamber, a pair ofsidewalls, and a twine handling assembly mounted between the sidewallsand forwardly of the opening. The twine handling assembly includes atleast one twine arm having a twine dispensing end from which twine isdispensed in the vicinity of the infeed opening and fed therethrough forapplying a plurality of helical wraps on the cylindrical package of cropmaterial formed in the chamber. The baler further comprises twinecutting apparatus having a twine cutting mechanism for cutting thetwine, and a twine guide assembly mounted on one of the side walls forguiding the twine to the cutting mechanism after a predetermined amountof twine has been dispensed. The present invention more specificallycontemplates twine cutting apparatus in which means are provided formoving the twine cutting mechanism from a remote inoperative position toan operative position adjacent one of the sidewalls.

The foregoing and other objects, features and advantages of theinvention will appear more fully hereinafter from a consideration of thedetailed description which follows, in conjunction with the accompanyingsheets of drawings wherein one principal embodiment of the presentinvention is illustrated by way of example. It is to be expresslyunderstood, however, that the drawings are for illustrative purposes andare not to be construed as defining the limits of the invention.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagrammatic side elevational view of a round baler in whichthe present invention is incorporated.

FIG. 2 is a diagrammatic side elevational view, similar to FIG. 1, of around baler with its forming chamber in the full bale position.

FIG. 3 is a view taken in the direction of arrows 3--3 in FIG. 2.

FIG. 4 is a view similar to FIG. 3 and shows the twine dispensing armsextending rearwardly.

FIG. 5 is also a view similar to FIG. 3 and shows the twine cutting armsextending rearwardly.

FIG. 6 is a view taken in the direction of arrows 6--6 in FIG. 5.

FIG. 7 is an enlarged view similar to FIG. 6 illustrating the operativerelationship of selected elements.

FIG. 8 is a plan view of the twine cutting assembly of the presentinvention.

FIG. 9 is a view taken in the direction of arrows 9--9 in FIG. 8.

FIGS. 10A 10C, 10E and 10G are side elevational views showing a sequenceof the relative positions of various elements of the twine cuttingmechanism of the present invention.

FIGS. 10B, 10D 10F and 10H are plan views corresponding to FIGS. 10A,10C, 10E and 10G, respectively.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring now to the drawings for a more detailed description of thepreferred embodiment of the invention, FIG. 1 shows a round baler 10 ofthe type having an expandable chamber defined by belts and rollers, asgenerally disclosed in U.S. Pat. No. 4,870,812, issued Oct. 12, 1989 inthe name of Richard E. Jennings, et al.

Round baler 10, which incorporates the preferred embodiment of thepresent invention, includes a main frame 11 supported by a pair ofwheels 12 (only one shown). A tongue 13 is provided on the forwardportion of main frame 11 for connection to a tractor. Pivotallyconnected to the sides of main frame 11 by a pair of stub shafts 15 istailgate 14 which may be closed (as shown in FIGS. 1 and 2) during baleformation or pivoted open about stub shafts 15 to discharge a completedbale. A conventional pickup 16, mounted on main frame 11, includes aplurality of fingers or tines 17 movable in a predetermined path to liftcrop material from the ground and deliver it rearwardly toward a floorroll 18, rotatably mounted on main frame 11.

A chamber for forming bales is defined partly by a sledge assembly 20comprising a plurality of rollers 21, 22, 23 extending transversely ofthe main frame 11 in the arcuate arrangement seen in FIG. 1 and 2.Rollers 21, 22, 23 are journalled at their ends in a pair of spacedapart arms 24, one of which is shown. These arms are pivotally mountedinside main frame 11 on stub shafts 26 for providing movement of sledgeassembly 20 between the bale starting position shown in FIG. 1 and thefull bale position shown in FIG. 2. Rollers 21, 22, 23 are driven in acounter-clockwise direction by conventional means (for example, chainsand sprockets) connected with a drive shaft 28 which in turn isconnected to the power-take-off of a tractor. A starter roll 30, locatedadjacent roller 23, is also driven counter-clockwise. A freely rotatableidler roller 31, carried by arms 24, moves in an arcuate path withsledge assembly 20.

The bale forming chamber is further defined by an apron 32 comprising aplurality of continuous side-by-side belts supported by guide rolls 33,34, 35, 36, 37 rotatably mounted in tailgate 14. Apron 32 is alsosupported on a drive roll 38, mounted on main frame 11. Although apron32 passes between roller 21 on sledge assembly 20 and idler roller 31,it is in engagement only with idler roller 31 and not roller 21 which islocated in close proximity to the apron belts and serves to strip cropmaterial from the belts, in addition to its bale forming function.Suitable coupling means (not shown) connected to drive shaft 28 providerotation of drive roll 38 in a direction causing movement of apron 32along the varying paths indicated generally by arrows a and b in FIGS. 1and 2. An additional guide roll 40 in the main frame 11 ensures properdriving engagement between apron 32 and drive roll 38. A pair of take uparms 41 (only one shown) are pivotally mounted on main frame 11 by across shaft 42 for movement between inner and outer positions shown inFIGS. 1 and 2, respectively. Belt tension lever arms 45 (one shown) arealso mounted to pivot with take up arms 41, which carry additional guiderolls 43, 44 for supporting apron 32. An hydraulic cylinders 46 ismounted on tail gate 14 and normally urges lever arms 45 and take uparms 41 toward their inner positions (FIG. 1), as the bale diameterincreases.

When the elements of round baler 10 are disposed as shown in FIG. 1 withtailgate 14 closed, an inner course c of apron 32 extends between guideroll 37 and idler roll 31. Rollers 21, 22, 23 are inclined rearwardly onsledge assembly 20 to define with course c the bale core startingchamber. Apron inner course c forms the rear wall of the chamber whilethe inwardly facing peripheral surfaces of rollers 21, 22, 23 define ina general manner a rearwardly inclined cooperating front wall. Floorroll 18 defines the bottom of the chamber and starter roller 30, spacedfrom floor roll 18, provides the upper boundary of an inlet for cropmaterial.

As round baler 10 is towed across a field, pickup tines 17 lift cropmaterial from the ground and deliver it through the inlet. The cropmaterial is carried rearwardly by floor roll 18 into engagement withapron inner course c (FIG. 1) which urges it upwardly and slightlyforwardly into engagement with rollers 21, 22, 23. In this manner cropmaterial is coiled in a clockwise direction to start a bale core.Continued feeding of crop material into the bale forming chamber bypickup tines 17 causes the apron inner course c to expand in lengtharound a portion of the circumference of the bale core as the diameterincreases. Take up arms 41 rotate conjointly with lever arms 45 fromtheir inner positions shown in FIG. 1 toward their outer positions shownin FIG. 2 to provide for expansion of the inner course of the apron in awell known manner, i.e., in effect the outer course of the belts ofapron 32 is diminished in length while the inner course increases a likeamount. After a bale has been formed and wrapped, tailgate 14 is openedand the bale is ejected rearwardly. Subsequent closing of tailgate 14returns the apron inner and outer courses of the belts of apron 32 tothe locations shown in FIG. 1.

During bale formation, sledge assembly 20 also moves between a balestarting position (FIG. 1) to a full bale position (FIG. 2). Thismovement of sledge assembly 20 causes idler roller 31 to move in anarcuate path while maintaining apron 32 in close proximity to roller 21,thereby allowing roller 21 to strip crop material from the belts ofapron 32 and prevent or reduce significantly the loss of crop materialbetween roller 21 and apron 32 during formation of a bale. Sledgeassembly 20 is pushed outwardly towards its full bale position duringbale formation as the crop material expands against rollers 21, 22, 23and then subsequently is pulled inwardly by apron 32 to the positionshown in FIG. 1 during bale ejection.

Before turning to the twine cutting apparatus of the present invention,which apparatus is generally designated by reference numeral 47 in FIGS.1 and 2, reference is made to U.S. Pat. No. 5,184,545, issued Feb. 9,1993 in the name of Richard E. Jennings, et al, which is directed toautomatic twine wrapping apparatus, hereby incorporated by reference.The Jennings, et al twine wrapping apparatus is similar to the twinewrapping apparatus used in baler 10 and generally designated byreference numeral 48 in FIGS. 1 and 2.

Now turning to FIGS. 3 and 4 for a detailed description of twinewrapping apparatus 48, a frame member 50, mounted between sidewalls 51,52, supports a pair of twine arms 53, 54 shown in their home position inFIG. 3 and in their rearwardly extended position in FIG. 4. The arms,coupled together by first and second link members 55, 56, each comprisefirst and second members 57, 58 and 60, 61. The second members are eachtelescopically mounted within its corresponding first member, and atwine dispensing end 62, 63 is disposed at the outer ends of each of thesecond members. The link members have outer ends 64, 66 and inner ends65, 67 (see FIG.4) whereby the outer end of each is pivotally coupled tothe second member of one of the twine arms and the inner end is attachedto the first member of the other twine arm. More specifically, firstlink member 55 comprises outer end 66 and inner end 67, the inner end ofwhich is pivotally connected, via a pivot pin 68, to a rigid strap 70,which in turn is affixed to first member 58 of twine arm 53. Likewise,second link member 56 comprises outer end 64 and inner end 65, the innerend of which is pivotally connected, via pivot pin 71, to rigid strap72, which in turn is affixed to first member 61 of twine arm 54.

Twine arm 53 is driven in a counter clockwise direction and twine arm 54is driven in a clockwise direction when the driven link 73 urges link 74from the position shown in FIG. 4 to the position shown in FIG. 3. Dueto the unique coupling arrangement between the twine arms, which isshown and explained in detail in the Jennings et al patent, the twinearms rotate from the position shown in FIG. 4 to the position shown inFIG. 3 with the second member of each arm retracting within the firstmember of each arm.

Driven link 73 is pivotally attached to plate 75, which is rotated aboutpivot 76 when actuator arm 77 (of actuator 78), affixed to plate 75 atend 80, reciprocates between the retracted and extended positions, shownin FIGS. 3 and 4. Thus, when actuator arm 77 is fully extended as shownin FIG. 4, twine arms 53, 54 are in their rearwardly extending position,and when actuator arm 77 is in the retracted condition shown in FIG. 3,twine arms 53, 54 are in their home position.

A pair of twine guides 81, 82, each of which is in the generalconfiguration of an S shaped rod, extend inwardly from and are affixedto side walls 51, 52, respectively. These guides are positioned toreceive the twine in bights 83, 84 as it is being dispensed from thetwine arms to the ends of a round bale being wrapped in a customaryfashion. FIG. 4 depicts four partial phantom views, 85, 86, 87, 88 oftwine arm 54 to illustrate the position of twine t relative to guide 81as the twine approaches guide 81 (sequential positions 85 and 86) and isultimately guided in bight 83 (position 87). Finally, twine t remainsguided by bight 83 as twine arm is about to come to rest in its homeposition (position 88). A similar series of positions take place withrespect to twine arm 54 and guide 82 when the twin twine arm systemshown is employed.

FIGS. 3 and 4 show twine cutting assemblies 90, 91 in transverselyoriented home positions, generally parallel to frame member 50. Eventhough a twin twine cutting arrangement is shown operative with twintwine dispensing arms, it should be clear that the present inventionwill function equally as well in a single twine arrangement.Accordingly, the following description will in some instances, for thesake of convenience, be directed only to twine cutting assembly 90, butit is the intention that it apply equally to twine cutting assembly 91.

Twine cutting assemblies 90, 91 are pivotally mounted on brackets 92,93, affixed and extending inwardly from side walls 51, 52, to permitreciprocative operation between the home positions shown in FIG. 4 andthe extended positions shown in FIG. 5. Each assembly includes a knife94 (see FIG. 8) mounted on the outer end of a support arm 95, 96, firstand second fixed twine guide plates 97, 98 and 100, 101, respectively,and a moveable twine guide plate 102, all of which plates operate in amanner described below to guide twine to the knife. As clearly shown inFIGS. 8 and 9, moveable twine guide plate 102, is pivoted with mountingblock 103 via pin 104, and is urged into the position shown in solidlines by coil spring 105, wrapped around block 103 and secured tosupport arm 95. Block 103 is free to pivot about pin 104 to phantomposition 106 (FIG.9) against the force of spring 105, i.e., when theforce of spring 105 is overcome. A V shaped notch 107 in moveable twineguide plate 102 is positioned to be slightly above the top edge of fixedtwine guide plate under conditions where block 103 is urged into itsrest position. The importance of notch 107 in moveable guide plate 102,as well as its shape, will become apparent in the description of theoperation.

Again referring to FIGS. 8 and 9, knife 94 is illustrated as being heldin a symmetrical bracket 108, the outer edge of which comprises firsttwine guide plate 97, affixed to the outer end of support arm 95 by bolt110. The purpose of this unique shape is to permit the twine cuttingassembly to be readily adapted for use on either side of the baler.Also, only half of the cutting edge of knife 94 is operative whichleaves the other half available for use by simply loosening bracket 108and reversing the position of the exposed ends of the cutting edge.

Twine cutting assembly 90 is pivotally mounted to bracket 92 via pin 111secured to bracket 92 by flange 112 extending from securing plate 113and affixed in slot 114. Support arm 95 is secured to sleeve 115 androtates about pin 111 with sleeve 115 when movement is imparted viamounting shoulders 116, 117 attached thereto. Thus, when rod 118 isdriven in a generally rearward direction it urges compressed spring 120against vertical pin 121 and thereby rotates support arm 95 to theposition shown in FIG. 8 by virtue of the movement of pin 121 in anarcuate path counterclockwise about vertical pin 111, which moving pinis accommodated by appropriate holes in shoulders 116, 117 withdiameters slightly greater than the diameter of such pin. Twine cuttingassembly 90 is also shown in its extended position in FIG. 5, whereas inFIG. 4 it has been returned to its home position by rod 118.

A pair of legs 122, 123, coupled to rods 118, 124, are attached totransverse drive rod 125 to move twine cutting assemblies 90, 91 fromthe home position (FIG. 4) to the extended position (FIG. 5) whentransverse drive rod 125 is rotated to move the legs from right to left,as viewed in FIG. 6, where leg 122 is shown. Drive rod 125 is urged in aclockwise direction by spring 126, which is under tension and maintainsa torque on drive rod 125 via pin 127, as shown in FIG. 7, to return thetwine cutting assemblies to their home positions when drive rod 125 isreleased in a manner discussed below.

The drive arrangement for the twine cutting assemblies is synchronizedwith the drive arrangement for the twine arms, both of which are movedfrom home positions to operative positions and back to home by actuator78. Initially actuator arm 77 is in the retracted position shown in FIG.3 and the twine dispensing arms 53, 54 and twine cutting assemblies 90,91 are in their transverse home positions, substantially parallel toframe member 50. When plate 75 is pivoted to move the twine dispensingarms to the position shown in FIG. 4, the twine cutting assembliesremain in the home position. During the latter part of the travel oftwine dispensing arms through the positions shown in phantom in FIG. 4,twine cutting assemblies 90, 91 are moved to their rearwardly extendingpositions shown in FIG. 5 when actuator arm is retracted to the pointwhere rod 128 is engaged by the rearward limit of lost motion slot 130.

Now turning to the specific details of the twine cutting assembly driveshown in FIG. 6, rod 128 is moved to the right by plate 75 to cause leg131 to pivot in a clockwise direction and move cutter drive plate 132 tothe left. This in turn moves pin 133, extending from pivot arm 134, tothe left along with leg 122 which is affixed to transverse drive rod125. As leg 131 is continued in a clockwise direction by virtue ofactuator arm 77, pin 133 is urged out of the detent portion 136 of slot136 in cutter drive plate 132 by engagement of plow bolt 137 with thecam surface 138 of cutter drive plate 132. Leg 122 and pivot arm 134 arethen free to rotate in a clockwise direction with transverse drive rod125 under the force of spring 127, shown in more detail by the rightmost position 140 of leg 122 and pivot arm 134 in FIG. 7, which returnstwine cutting assembly 90 from the extended position (FIGS. 6 and 7) toits home position.

In operation, twine cutting assembly captures and cuts twine t, as it isheld in position by twine guides 81, 82, during its travel from its homeposition to its fully extended position. Upon arrival of twine cuttingmechanism at its fully extended position, it is released andautomatically returned to its home position. Thus the cutting mechanismis only in the vicinity of the bale forming environment during the veryshort period of time necessary to accomplish twine cutting.

Now turning to the sequential views of FIGS. 10A through 10H for a moredetailed description of the operation, twine t is shown traveling towardthe bale being wrapped in the bale chamber defined by apron 32 (FIG. 2).In FIGS. 10A and 10B the twine cutting assembly is shown as it isswinging in the direction of arrow 141 just prior to capturing twine t,and twine t is shown in phantom prior to being guided by bight 83 ofguide 81, i.e., the path of travel of twine t is being shifted in thedirection of arrow 142 by the swinging motion of the twine arm, asillustrated in FIG. 4.

In FIGS. 10C and 10D the cutting assembly continues to swing in thedirection of arrow 143 and has captured twine t which is stilldispensing toward the bale chamber and is guided in bight 83. During thecapturing process, moving twine t is engaged by second twine guide plate100 (see relationship of twine and guide in FIG. 10A) to guide the twineto the moveable twine guide plate 102, and first twine guide plate 97 ifnecessary, to assure that it rides up the slanted surface 144 of secondguide plate 100 and into notch 107.

As twine t engages V shaped notch 107, moveable guide plate 102 beginsto pivot (FIGS. 10E and 10F) in a counter clockwise direction (see arrow145) by virtue of the frictional force imparted by the twine which isbeing pulled through the notch in the direction of the bale beingwrapped. The twine path moves along the notch until it is firmly grippedby the sides of the notch to maintain pivotal motion. Twine cuttingassembly 90 continues to swing in the direction of arrow 146 whichmotion, along with S shaped twine guide 81, assures that the twine willremain securely clenched by the V shaped notch 107 in guide 102.

The angle between the twine and knife 94 increases as moveable twineguide plate continues to pivot from the position show in FIG. 10E to theposition shown in FIG. 10G. This results in the twine being cut cleanlyand decisively as it continues to be dispensed and pulled against andalong the cutting edge as shown in FIG. 10H. As soon as the twine hasbeen cut (FIG. 10G) the moveable twine guide will return by spring 105from the position shown in FIG.10G to the position shown in FIG. 10A andtwine cutting assembly will spring back to its home position asdiscussed above.

While preferred structure in which the principles of the presentinvention have been incorporated is shown and described above, it is tobe understood that the invention is not limited to such structure, butthat, in fact, widely different means of varying scope and configurationmay be employed in the practice of the invention.

Having thus described the invention, what is claimed is:
 1. In a roundbaler comprising a chamber for forming a cylindrical package of cropmaterial, a generally transverse crop infeed opening in said chamber, apair of sidewalls, a twine handling assembly mounted between saidsidewalls and forwardly of said opening, said twine handling assemblyincluding at least one twine arm having a twine dispensing end fromwhich twine is dispensed in the vicinity of said infeed opening and fedtherethrough for applying a plurality of helical wraps on thecylindrical package of crop material formed in said chamber, said twinehandling assembly further including means for controllably moving saidtwine arm to dispense twine across said opening from said twinedispensing end, and twine cutting apparatus having a twine cuttingmechanism for cutting the twine, the improvement comprisingsaid twinecutting apparatus including means for transferring said twine cuttingmechanism from a remote inoperative position to an operative positionadjacent one of said sidewalls.
 2. A round baler as set forth in claim 1wherein said means for transferring said twine cutting mechanismincludessupport means on which said twine cutting mechanism is mounted,and means for moving said support means from a first position to asecond position whereby said twine cutting mechanism is transferred fromits remote inoperative position to its operative position adjacent saidone of said sidewalls.
 3. A round baler as set forth in claim 2 whereinsaid support means comprisean arm having a distal end to which saidtwine cutting mechanism is attached, and pivot means for swinging saidarm between said first and second positions.
 4. A round baler as setforth in claim 3 wherein said arm is arranged between said pair of sidewalls in said first position and is generally parallel to said sidewalls in said second position.
 5. A round baler as set forth in claim 4wherein said distal end extends toward said crop infeed opening in saidsecond position.
 6. A round baler as set forth in claim 5 wherein saidpivot means is mounted on said one of said pair of said side walls. 7.In a round baler comprising a chamber for forming a cylindrical packageof crop material, a generally transverse crop infeed opening in saidchamber, a pair of sidewalls, a twine handling assembly mounted betweensaid sidewalls and forwardly of said opening, said twine handlingassembly including at least one twine arm having a twine dispensing endfrom which twine is dispensed in the vicinity of said infeed opening andfed therethrough for applying a plurality of helical wraps on thecylindrical package of crop material formed in said chamber, said twinehandling assembly further including means for controllably moving saidtwine arm to dispense twine across said opening from said twinedispensing end, twine cutting apparatus having a twine cutting mechanismfor cutting the twine, and a twine guide assembly mounted on one of saidside walls for guiding the twine to said cutting mechanism after apredetermined amount of twine has been dispensed, the improvementcomprisingsaid twine cutting apparatus including means for transferringsaid twine cutting mechanism from a remote inoperative position to anoperative position adjacent said twine guide.
 8. A round baler as setforth in claim 7 wherein said means for transferring said twine cuttingmechanism includessupport means on which said twine cutting mechanism ismounted, and means for moving said support means from a first positionto a second position whereby said twine cutting mechanism is transferredfrom its remote inoperative position to its operative position adjacentsaid twine guide.
 9. A round baler as set forth in claim 8 wherein saidtwine guide is mounted on one of said pair of side walls.
 10. A roundbaler as set forth in claim 8 wherein said support means comprisean armhaving a distal end to which said twine cutting mechanism is attached,and pivot means for swinging said arm between said first and secondpositions.
 11. A round baler as set forth in claim 10 wherein said twineguide is mounted on one of said pair of side walls, and said pivot meansis also mounted on one of said pair of side walls.
 12. A round baler asset forth in claim 10 wherein said arm is arranged between said pair ofside walls in said first position and is generally parallel to said sidewalls in said second position.
 13. A round baler as set forth in claim10 wherein said distal end extends toward said crop infeed opening insaid second position.
 14. A round baler as set forth in claim 13 whereinsaid pivot means is mounted on said one of said pair of said side walls.